Much of what has been said here, could serve as evidence suggesting that the many-worlds theory is in fact false.
I just don't hold with the idea that a new universe is created every time something random occurs. It's a hugely over engineered way for the universe to behave.
Many worlds smells of people trying very desparately to hold on to the 4 properties of the universe that many people wish were real.
i.e.
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1> It is deterministic. You know exactly what will happen from a given situation.
2> There is no magic "quantum wave collapse".
3> It doesn't require hidden variables.
4> It is local: ie, you don't require faster-than-light communication between quantum hidden variables to explain waht is going on.
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If you can accept that any of these are false, then the many-worlds theory evaporates into implausible silliness, what with infinate probabilities, and people living forever etc.
By the way,
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Note that you won't be alive with anyone else: all your family and friends etc will die almost certainly.
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Is false, if it's extremely unlikely that you'll live forever, it's also extremely unlikely that only you, and your loved ones will too (only more so) Many Worlds would suggest that in some universe, you, and all your friends and family will live happily ever after, for ever, with a lifetime supply of magic beans.